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Commit f7038b7c authored by Sebastian Ott's avatar Sebastian Ott Committed by Martin Schwidefsky
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s390/pci/dma: fix accounting of allocated_pages 



allocated_pages sometimes are increased even if s390_dma_alloc fails
also this value is never decreased even if s390_dma_free is called.
This patch fixes these bugs.
Also remove the atomic64_t casts (the members are already of this type).

Reviewed-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 0c0c2776

arch/s390/pci/pci_dma.c

+8 −5
Original line number Diff line number Diff line
@@ -285,7 +285,7 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page, 
		flags |= ZPCI_TABLE_PROTECTED;



	if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {

		atomic64_add(nr_pages, (atomic64_t *) &zdev->fmb->mapped_pages);

		atomic64_add(nr_pages, &zdev->fmb->mapped_pages);

		return dma_addr + (offset & ~PAGE_MASK);

	}
@@ -313,7 +313,7 @@ static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr, 
		zpci_err_hex(&dma_addr, sizeof(dma_addr));

	}



	atomic64_add(npages, (atomic64_t *) &zdev->fmb->unmapped_pages);

	atomic64_add(npages, &zdev->fmb->unmapped_pages);

	iommu_page_index = (dma_addr - zdev->start_dma) >> PAGE_SHIFT;

	dma_free_iommu(zdev, iommu_page_index, npages);

}
@@ -332,7 +332,6 @@ static void *s390_dma_alloc(struct device *dev, size_t size, 
	if (!page)

		return NULL;



	atomic64_add(size / PAGE_SIZE, (atomic64_t *) &zdev->fmb->allocated_pages);

	pa = page_to_phys(page);

	memset((void *) pa, 0, size);
@@ -343,6 +342,7 @@ static void *s390_dma_alloc(struct device *dev, size_t size, 
		return NULL;

	}



	atomic64_add(size / PAGE_SIZE, &zdev->fmb->allocated_pages);

	if (dma_handle)

		*dma_handle = map;

	return (void *) pa;
@@ -352,8 +352,11 @@ static void s390_dma_free(struct device *dev, size_t size, 
			  void *pa, dma_addr_t dma_handle,

			  struct dma_attrs *attrs)

{

	s390_dma_unmap_pages(dev, dma_handle, PAGE_ALIGN(size),

			     DMA_BIDIRECTIONAL, NULL);

	struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));



	size = PAGE_ALIGN(size);

	atomic64_sub(size / PAGE_SIZE, &zdev->fmb->allocated_pages);

	s390_dma_unmap_pages(dev, dma_handle, size, DMA_BIDIRECTIONAL, NULL);

	free_pages((unsigned long) pa, get_order(size));

}